Given figure is of filamentous. Blue gre...

Given figure is of filamentous. Blue green alga Nostoc. Identify the parts marked as A and B and select the correct option.

A

`{:(,A,B),((a),"Heterocyst","Mucilaginous sheath"):}`

B

`{:(,A,B),((b),"Vegetative cell","Mucilaginous sheath"):}`

C

`{:(,A,B),((c),"Trichomes","Cell wall"):}`

D

`{:(,A,B),((d),"Muclilaginous sheath","Heterocyst"):}`

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The correct Answer is:

A

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